问题
选择题
分解因式:(x+y)2-4(x+y)+4的结果是( )
A.(x+y+2)2
B.(x+y-2)2
C.(x-y+2)2
D.(x-y-2)2
答案
(x+y)2-4(x+y)+4=(x+y-2)2.
故选B.
分解因式:(x+y)2-4(x+y)+4的结果是( )
A.(x+y+2)2
B.(x+y-2)2
C.(x-y+2)2
D.(x-y-2)2
(x+y)2-4(x+y)+4=(x+y-2)2.
故选B.